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ICS853054AGLF Datasheet(PDF) 10 Page - Integrated Circuit Systems |
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ICS853054AGLF Datasheet(HTML) 10 Page - Integrated Circuit Systems |
10 / 15 page Integrated Circuit Systems, Inc. 853054AG www.icst.com/products/hiperclocks.html REV. A JANUARY 5, 2006 10 ICS853054 4:1, DIFFERENTIAL-TO-3.3V OR 2.5V LVPECL/ECL CLOCK MULTIPLEXER PRELIMINARY TERMINATION FOR 2.5V LVPECL OUTPUT Figure 4A and Figure 4B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to ter- minating 50 Ω to V CC - 2V. For VCC = 2.5V, the VCC - 2V is very close to ground level. The R3 in Figure 4B can be eliminated and the termination is shown in Figure 4C. FIGURE 4C. 2.5V LVPECL TERMINATION EXAMPLE FIGURE 4B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 4A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE R2 62.5 Zo = 50 Ohm R1 250 + - 2.5V 2,5V LVPECL Driv er R4 62.5 R3 250 Zo = 50 Ohm 2.5V VCC=2.5V R1 50 R3 18 Zo = 50 Ohm Zo = 50 Ohm + - 2,5V LVPECL Driv er VCC=2.5V 2.5V R2 50 2,5V LVPECL Driv er VCC=2.5V R1 50 R2 50 2.5V Zo = 50 Ohm Zo = 50 Ohm + - |
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